CVE-2026-54806: CWE-502 Deserialization of Untrusted Data in Melapress WP Activity Log
CVE-2026-54806 is a critical vulnerability in Melapress WP Activity Log versions up to and including 5.6.3.1. It involves unauthenticated PHP object injection, classified under CWE-502 (Deserialization of Untrusted Data). This vulnerability allows an attacker to execute arbitrary code without any authentication. The CVSS score is 9.8, indicating a high impact on confidentiality, integrity, and availability.
AI Analysis
Technical Summary
This vulnerability in WP Activity Log (<=5.6.3.1) allows unauthenticated attackers to perform PHP object injection via deserialization of untrusted data (CWE-502). This can lead to remote code execution with no required privileges or user interaction. The vulnerability is critical with a CVSS 3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). No official patch or remediation level is currently provided by the vendor or advisory sources.
Potential Impact
Successful exploitation results in full compromise of the affected system, including complete loss of confidentiality, integrity, and availability. Attackers can execute arbitrary code remotely without authentication, posing a severe risk to affected installations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the affected plugin and consider disabling it if feasible. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-54806: CWE-502 Deserialization of Untrusted Data in Melapress WP Activity Log
Description
CVE-2026-54806 is a critical vulnerability in Melapress WP Activity Log versions up to and including 5.6.3.1. It involves unauthenticated PHP object injection, classified under CWE-502 (Deserialization of Untrusted Data). This vulnerability allows an attacker to execute arbitrary code without any authentication. The CVSS score is 9.8, indicating a high impact on confidentiality, integrity, and availability.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in WP Activity Log (<=5.6.3.1) allows unauthenticated attackers to perform PHP object injection via deserialization of untrusted data (CWE-502). This can lead to remote code execution with no required privileges or user interaction. The vulnerability is critical with a CVSS 3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). No official patch or remediation level is currently provided by the vendor or advisory sources.
Potential Impact
Successful exploitation results in full compromise of the affected system, including complete loss of confidentiality, integrity, and availability. Attackers can execute arbitrary code remotely without authentication, posing a severe risk to affected installations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the affected plugin and consider disabling it if feasible. Monitor vendor channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Patchstack
- Date Reserved
- 2026-06-16T09:21:34.477Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3280550b89be688830004e
Added to database: 06/17/2026, 11:09:09 UTC
Last enriched: 06/24/2026, 16:32:22 UTC
Last updated: 08/01/2026, 07:18:01 UTC
Views: 87
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